Toxic cement.



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UNITED STATES PATENT ()FFI HENRY BLU'MENZBEBG, .13., OF 030 GRLNDE,CALIFORNIA.

TOXIC CEMENT.

1,296,468. No Drawing.

To all whom it may concern:

Be it known that I, HENRY BLUMENBERG, Jr., a citizen of the UnitedStates, residing at Oro Grande, in the county of San Ber- 5 nardino andState of California, have in vented new and useful Improvements in ToxicCement, of which the following is a specification.

l pipe, besides disintegrating the pipe itself through the expansion ofthe roots through the pores of the pipe. Furthermore I have found thatthe cement made in accordance with this invention is far denser andstronger than when the ofiTy'EhTI nent is used. y mvention consists inthe new composition of matter as hereinafter described and claimed.

I have discovered that by the addition of not more than one-half percent. of copper 80 sulfate by weight of the dr cemen use mngcementitious struc ures -an dissolving the same in water used for makingthe cementitious mixture, the resulting product is very much bar and hasa higher 85 tensil strength t an the ordinary cement without theaddition of copper sulfate. When more than onehalf er cent ofcopthesetlifi lif e cement the long, but the copper sulfate 40 may beused in considerably larger quantities, providedthe same is mixed in agranulated form with the concrete.

In place of dissolving the copper sulfate Specification of LettersPatent.

Application filed May 81, 1918. Serial No. 237,611.

' My invention relates to a toxic h draulic A cement especially usefulin the manufacture Patented Mar. 4,1919.

in the water for making concrete ind the and ground therewit or mav emix .m-

a ry cemen a any stage of its manufagture.

like, the same may be mixed with a clinker\ per salt ma as oun s of rs ggals 0 an e 1e 9 the setting of the cement for practical pur poses orotherwise render the same inferior in other respects, such as density,hardness or strength. However, I have found that copper sulfate used asdescribed, gives the strongest and best concrete.

While the preferred method is to add the toxic compound to the cementeither in the dry cement or in the concrete, the toxic compound may beapplied after the concrete cementitious structure has set, by means of asolution by spraying or brushing, or any other suitable means.

Various changes in the steps of my process may be made by those skilledin the art without departing from the spirit of my invention, asclaimed.

The copper sulfate, it will be understood. does not remain as such inthe cement after the same is mixed with water, but forms 0 er hvdroxidwhose toxic qualities are well n Ihe cement thus treated is escopies ofthis patent may be obtained for five cents each, by addressing theCommissioner of Patents,

Washington, D. G.

